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Derivatives - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 09, 2021
Derivatives
Accumulated other comprehensive pre-tax gain (loss) to be reclassified into revenue within the next 12 months	$ (6.6)
3.600% Notes Due 2022
Derivatives
Stated interest rate (as a percent)		3.60%
1.350% Notes Due 2026
Derivatives
Stated interest rate (as a percent)	1.35%	1.35%		1.35%
Business Solutions
Derivatives
Foreign exchange revenues	$ 27.8	$ 177.4	$ 366.8
Designated as hedges | Foreign currency contracts
Derivatives
Derivative policy - contract maturity period maximum	36 months
Derivative policy - targeted weighted-average maturity	1 year
Maximum remaining maturity of foreign currency derivatives	24 months
Derivative weighted-average maturity	1 year
Not designated as hedges | Foreign currency contracts | Business Solutions
Derivatives
Notional amounts		$ 3,000.0
Minimum | Not designated as hedges | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range	2 days
Maximum | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range	1 month
Maximum | Foreign Currency Denominated Cash and Other Asset and Other Liability Positions
Derivatives
Foreign currency forward contracts maturity range	1 year
Maximum | Not designated as hedges | Uncollected Settlement Assets and Obligations
Derivatives
Foreign currency forward contracts maturity range	1 month
Maximum | Not designated as hedges | Foreign Currency Denominated Cash and Other Asset and Other Liability Positions
Derivatives
Foreign currency forward contracts maturity range	1 year

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480870/815-30-50-1

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- Definition

Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Derivative contract maturity period, maximum, per the Company's policy.

+ References

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- Definition

Derivative Policy Targeted Weighted Average Maturity

+ References

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- Definition

Represents revenue based on the difference between the exchange rate set by the Company to the customer and the rate at which the Company or its agents are able to acquire currency.

+ References

No definition available.

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